linux-kernel - [PATCH 3.17 006/319] vxlan: using pskb_may

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Message-Id: <20141112010953.706830320@linuxfoundation.org>
Date:	Wed, 12 Nov 2014 10:12:24 +0900
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Cong Wang <xiyou.wangcong@...il.com>,
	Li RongQing <roy.qing.li@...il.com>,
	"David S. Miller" <davem@...emloft.net>
Subject: [PATCH 3.17 006/319] vxlan: using pskb_may_pull as early as possible

3.17-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Li RongQing <roy.qing.li@...il.com>

[ Upstream commit 91269e390d062b526432f2ef1352b8df82e0e0bc ]

pskb_may_pull should be used to check if skb->data has enough space,
skb->len can not ensure that.

Cc: Cong Wang <xiyou.wangcong@...il.com>
Signed-off-by: Li RongQing <roy.qing.li@...il.com>
Signed-off-by: David S. Miller <davem@...emloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/net/vxlan.c |    6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

--- a/drivers/net/vxlan.c
+++ b/drivers/net/vxlan.c
@@ -1440,9 +1440,6 @@ static int neigh_reduce(struct net_devic
 	if (!in6_dev)
 		goto out;
 
-	if (!pskb_may_pull(skb, skb->len))
-		goto out;
-
 	iphdr = ipv6_hdr(skb);
 	saddr = &iphdr->saddr;
 	daddr = &iphdr->daddr;
@@ -1929,7 +1926,8 @@ static netdev_tx_t vxlan_xmit(struct sk_
 			return arp_reduce(dev, skb);
 #if IS_ENABLED(CONFIG_IPV6)
 		else if (ntohs(eth->h_proto) == ETH_P_IPV6 &&
-			 skb->len >= sizeof(struct ipv6hdr) + sizeof(struct nd_msg) &&
+			 pskb_may_pull(skb, sizeof(struct ipv6hdr)
+				       + sizeof(struct nd_msg)) &&
 			 ipv6_hdr(skb)->nexthdr == IPPROTO_ICMPV6) {
 				struct nd_msg *msg;
 


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